Bahrain Erupts Before Protest Anniversary

DOHA, Qatar—Riot police clashed with protesters across Bahrain on Monday, the eve of the first anniversary of the country's pro-democracy uprising, in some of the worst violence seen there for months.

Thousands of protesters who had been attending a legal antigovernment rally marched Monday afternoon down a highway to the capital, Manama, headed for Pearl Roundabout, the cradle of Bahrain's uprising last year. Protesters hurled rocks...